Clamp for concrete-forms



T. H. SINCLAIR.

CLAMP FOR CONCRETE FORMS.

APPLICATION FILED IAILZE, I920.

1,354,516. I Patented 001;. 5,1920.

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/IO Fig.4 I/wmvrm 9 I 220M176 H S/NCLH/R 6 4 6 Y 1W concrete form, all as hereinafter THOMAS HENRY SINCLAIR, OE

HAMILTGN, ONTA RIO, CANADA.

CLAMP FOR CONCRETE-FORMS.

Application filed January 26, 1929.

To all whom it may concern:

Be it known that I, THOMAS HENRY SIN- CLAIR, of the city of Hamilton, in the county of VVentworth, Province of Ontario, Dominion of Canada,'have invented certain new and useful Improvements in Clamps for Concrete-Forms, of which the following is the specification.

My invention relates to improvements in clamps for concrete forms, and the object of the invention is to devise a clamp that can be readily applied to any particular form with the minimum of trouble, and which will be retained in place when so applied. A further object is to construct a clamp which will have a bearing on the form around its entire surface, and a still further object is to provide a clamp which will be adjustable and which can be tightened on being applied to the form.

My invention consists of a lower clamp portion serrated on its upper surface and provided with a plurality of lugs extending outwardly from its side surfaces, said lower clamp portion having a slot extending longitudinally of the same intermediately of its length, an upper clamp portion having a suitable recessed depending end and serrations on the lower side of such upper clamp portion adapted to engage the serrations on the upper face of the lower clamp portion, said upper clamp portion ha'vinga slot extending longitudinally of the same intermediately of its length andadapted to register with the aforesaid slot in the lower clamp portion when both portions are in position, a chain connected at one end to the lower clamp portion and adapted to be adjustably secured at the other end in the re cessed end of the upper clamp portion, said upper clamp portion having lugs extending outwardly from the sides thereof, a lever adapted to be inserted in between the lugs of the upper and lower clamp portions for adjusting the same relatively to one another, and means extendingthrough the registering slots in the upper and lower clamp portions for securing the clamp to a batten of the more particularly described and illustrated in the accompanying drawing in which Figure 1 represents a horizontal section of a concrete form, showing a clamping device constructed according to my invention applied thereto.

Fig. 2 is a longitudinal section through both portions of the clamp.

Specification of Letters Patent.

Patented Oct. 5, 1920. Serial No. 354,230.

Fig. 3 is a plan view thereof, and

F a: is a cross section.

Like characters of reference indicate corresponding parts in the different views.

1 is ,a concrete form, preferablv, constructed of wood, and, in the present instance, carrying the battens 2 which are beveled at their ends as is shown in i l. 3 is the lower clamp portion haw ing a slot extending longitudinally of the same intermcdiately of its length and prorided on its upper face with the serrations 5. 6 are a plurality of lugs extending outwan ly from the side faces of such lower portion.

7 a ring formed on one end of the lower portion to which is secured a chain 8. 9 is the upper clamp portion having a slot 10 extending longitudinally of the same intermediately of its length and provided with a plurality of lugs 11 extending outwardly from the top of such portion. 12 is the depending end of the upper clamp portion havlng a recess 13 with a confined neck-shaped entrance is adapted to receive the other end of the chain.

15 are serrations on the lower face of the upper 9 adapted to engage the afore said serrations 5 upon the upper clamp port on being applied to the lower clamp portion. 16 is a nail adapted to extend through the slots 4 and 10 and to secure the clamp to a batten 2, and 17 is a lever for moving the clamp portions relatively to each other for tightening up the chain.

The operation of the device is as follows:

The chain 8 is applied to the battens 2 as shown in Fig. 1, the free end of the chain being inserted in the recess 13 of the end 12 in such position as to hold the chain as tlghtly as possible around the battens by hand. The upper clamp portion 9 is now applied to the lower portion 3, the serrations 5 engaging the serrations 15. The lever 17 is now inserted in a suitable manner between the lugs 11 and the lugs 6 as is clearly shown in Fig. 2. By exerting pressure on the lever in the direction of ti e arrow in ig. 2, the portions are moved relatively to one another thus tightening up the chain 8 so that it has a bearing on the battens 2 throughout the entire periphery of the form. Thenail 'or' screw is now driven through the slots 10 and 4t intothe batten 2 as is shown in Fig. 1 thus holding the clamping device in position and preventing its displacement.

It is understood that a plurality of these clamping devices are used, the number depending upon the length of the form.

To release the device all that is necessary to do is to remove the nail or screw, insert I that I have deviseda clamp for concrete forms that will be simple and effective in use and which can be readily applied and adjusted with the mlnimum of labor.

IVhat I claim as my invention is. w-

1. In a clamping device for concrete forms, the combination with the form, of upper and lower clamp portions engaging each other, a member connected at one end to the lower portion and at the other end to'the upper portion, said member encircling the form, means for altering the relative position of the clamp'portions to each other for tightening the member encircling the form, and means for retaining the clamp portions in engagement with each other, said means extending through the clamp portions and securing the same to the form- 2. In a clamping device for concrete forms, the combination with the form, and battens secured thereto and beveled oil at their ends, the bevel of the adjacent ends of the battens being in the same plane, of upper and lower clamp portions engaging each other, a member connected at one end to the lower portion. and at the other end to the upper portion, said member encircling the wood battens, means for altering the relative position of the clamp portions to each other for tightening the member encircling the form, and means for retainingthe clamp portions in engagement with each I other said means extending through the clamp portions and securing the same to the battens.

3-. Ina clampmg device for concrete forms, the combination with the form, of

upper and lower clamp portions respectively serrated on their lower and upper faces, such serrations adapted" to be in engagement with each other, a chain encircling the form, connected at one end to the lower clamp portion and at the other end adjustably connected to the upper portion, lugs on the sides of the upper and lower clamp portions, and a fork shaped lever inserted between the respective liws 4. In a clampingdevice for concrete vforms, the combination with the form, andbattcnsbeveled off at their ends, the bevel of the adjacent ends oi'the battens being in the same plane, of upper and lower clamp portions respectively serrated on their lower and upper faces, such serrations adapted to be in engagement with each other, a chain encircling the batten, connected atone end to the lower clamp portion and at the other end adjustably connected to the upper porti0n:,.ltrgs: on the sides of the upper and lower clamp portions and a fork shaped lever inserted between the respective lugs.

55. In a clamping device for concrete forms, the combination with the form, of upper and lower clamp portions engaging each other, and each having a slot extending longitudinally of the same and intermediately of the length of the same, said slots coinciding in the engaged position, means extending through the slots for securing the upper and lower clamp portions to the form, and a chain connected at one end to the lower portion and at the other end to the upper portions and encircling the form.

6. In a clamping device for concrete forms, the combination with the form and battens beveled'ofl? at their ends, the bevel of the adjacent ends of the battens being in the same plane, of upper and lower clamp portions engaging each other, and each having a slot extending longitudinally of the same and intermediately of the length of thesame, said slots coinciding in the engaged position, means extending through the slots for secu-ring the upper and lower clamp portions tothc batten, and a chain connected atone end the upper portion and encirclingthe batten.

7. In a clamping device for concrete forms, the combination with the form, of upper and lower clamp portions, serrations in the lower face of the upper portions and the upper face of the lower portion, said serrations adapted to engage each other, lugs on the sides of the; upper and lower portions, said portions each having a slot extending longitudinally thereth-rough intermediately of the length of the same, a lever, and a chain secured at one end to the lower portion and adjustably secured at the other end to the upper portion and encircling the form. V

S. In a clamping device for concrete forms, the combination with the form, and battens beveled oil at their ends, the bevel of the adjacent ends of the battens being in the same plane, of upper and lower clamp portions, serrations in the lower face of the upper portions and the upper face of the lower portion, said serrations adapted to engage each other, lugs on the sides of the upper and lower portions, said portions each having'a slot extending longitudinally therethrough intermediately of the length of the same, a lever, and a chain secured at one end to the lower portion and adjustably secured at the other end to the upper portion and encircling the batten.

THOMAS HENRY SINCLAIR. Witnesses:

, GERTRUDE NICHOLSON, JOHN G. HAYWARD. V 

